What version of ubuntu server are you specifically targeting?
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Seth♦Jun 17 '13 at 22:44

Yes it does support LVM/Encryption/RAID. Haven't you even tried booting up a server ISO? The server ISO is now the alternative to the alternate installer image now unavailable since 12.10. Just use the server ISO and you can activate "manual package selection" and pick the desktop environment you want.
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gertvdijkJun 17 '13 at 22:45

@gertvdijk I haven't tried downloading it without confirmation because I'm on metered internet...and this isn't flagposted anywhere I could find without a 700 MB download.
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hbdgafJun 17 '13 at 22:47

@gertvdijk okay the word encryption is not in there anywhere, so google and site search don't find it in the pictures.
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hbdgafJun 17 '13 at 22:57